Question

why 82 degree 30 minutes East has been selected as the Standard Meridian of India​

Answer 1

Because it lies in almost center of India.

Answer 2

82°30` E has been selected as the Standard Meridian of India because it is obvious to take the time of a country as a multiple of 7 1/2° abd the minimum difference in the time between countries should be 30 minutes.. And to have a common time in the country so that everything can be systematic and it will be easy for a country to work..

Hope i helped u